Speed-regulator for electromotors.



B. F. HUTUHES, JR.

SPEED REGULATOR FOR ELEGTROMOTORS.

APPLICATION FILED MAR. 2, 1910.

1,014,707- I Patented Jan. 16, 1912.

omm s BENJAMIN F. HUTQHES, JR, OF ALLENDALE, NEW JERSEY.

SPEED-REGULATOR FOR EL ECTBOMOTOBS.

Specification of Letters Patent.

Application filed Hatch 2, 1910. Serial No. 546,808.

To all whom it may concern:

Be it known that I, BENJAMIN F. HUTCHES, J r., a citizen of the UnitedStates, residingat Allendale, county of Bergen, State of New Jersey,have invented new and useful Improvements in Speed-Regulators forElectromotors, of which the following is a specification;

TlllS invention relates to a regulator of novel construction forcontrolling the speedofv electromotors and for maintaining such speedafter the regulator has been set. With my regulator the electromotorcannot exceed said speed even if the voltage of the current should rise,or if the load of the electromotor should be decreased to any extentdesired. In this way an undesirable acceleration of the motor isprevented, which would tend to unfavorably influence the mechanism ormachinery to which the electromotor 1s connected.

' In the accompanying drawing: Figure -1 is a sectional elevation of myimproved speed regulator, showing it applied to an electromotor; Fig. 2an inner View of the contact members and cotiperating parts; Fig. 3 avertical section on line 33, Fig. 1; Fig. 4 a similar section on line4-4, Fig. 1, showing the spiral cup in view, and Fig. 5 a wiringdiagram.

The numeral 10 indicates an electromotor which may be either acontinuous current motor or an alternating current motor. Forcontrolling the speed of motor 10, a centrifugal overnor A, is provided,which is 1 operatlvely connected to and rotates with the shaft 11 ofsaid motor. Governor A, may be of any suitable construction, it beingshown to be inclosed within the rim 12 of a fly wheel 13, the hub 14 ofwhich is secured to shaft 11. To hub 14 are pivoted, at 15, the arms 16which carry the balls 17. Arms 16 are, by links 18, connected to asleeve 19 which is slidably mounted upon a pin 20 extending outwardlyfrom hub 14, a coiled spring 21 being interposed between said sleeve andhub. The pointed outer end 22 of sleeve 19 is adapted to impinge againsta lever 23 which is hinged at 24 to a bearing 25 and constitutes amovable contact member. Bearing 25 is, by screws 26, secured to anupright plate 27 made of insulating macoiled around a pin 30 secured toplate 27 and passlng through a slot 31 of lever 23. At its outer face,lever 23 carries a contact plate 32 which is'adapted to engage acontact-pin 33 protrudin from a plunger 34 that constitutes anad]ustable contact member. Plunger 34 is telescoped by a tube 35 fittedinto a corresponding perforation of plate 27 and having a flange 36which is secured to said plate by a screw 37. A coiled spring 38interposed between plate 27 and a disk 39, secured to the outer end ofplunger 34 by screw 40, tends to draw the plunger outward. Plunger 34 ispartly cut away, as at 41, thereby forming a radial finger or abutment42 at the inner end of said plunger. This'finger is, by spring 38, heldin engagement with the spiral or camshaped rim 43 of a rotatable cup 44provided with an outwardly extending stem 45 which passes looselythrough a corresponding perforation of plate 27 and carries at its freeend handle 46. A pointer 47 is secured to handle 46 and plays over adial 48 which indicates the number of revolutions per minute of theelectromotor.

The tension of springs 21, 29, is such, that when the motor is at rest,the action of spring 21 will overcome that of spring 29. In this way,sleeve 19 forces lever 23 into contact with pin 33 of plunger 34, whilethe finger 42 of the latter rests against rim 43. By turning cup 44 inthe direction of the arrow, (Fig. 2), plunger 34 is moved inward tocorrespondingly advance sleeve 19 toward hub 14, thus swinging balls 17outward. When cup 44 is turned in the opposite direction, spring 38 willcause plunger 34 to recede, in which movement lever 23 and sleeve 19will participate owing to the action of spring 21. In this way, balls 17will be swung inward, as will be readily understood.

It will be seen that if, during the operation of the motor, the speed ofthe shaft is lower than that which corresponds to the divergence towhich balls 17 have been set by spiral cup 44, spring 21, in pressingagainst sleeve 19, will maintain the proper contact between lever 23 andplunger 34. But as soon as the speed of shaft 11 rises to such a degreeas will withdraw sleeve 19 from lever 23, through the increaseddivergence of balls 17 spring 29 will tilt said lever inward to break1ts contact with plunger 34. The scale of dial 48 is so computedPatented Jan. 16, 1912.

that its numerals indicate the nuniben of rotations which are attainedby shaft 11 immediately before contact is interrupted between parts 23,34, owing to the withdrawal of sleeve 19. Y

In use, one pole of a suitable source of electricity'is, by wire 49,connected to electromotor 10, while its other pole is, by wire 50,connected to bearing 25, a switch 51 being provided in one of saidWires. Tube is, by wire 52, connected with electromotor 10. Afterpointer 47 has been set to the speed desired, switch 51 is closedviously flowing through the electromotor' will be interrupted, so thatthe speed thereof will decrease until contact is again establishedbetween lever 23 and plunger 34, thus giving a new impulse to the motor.properly dimensioning fly wheel 13, any undue fluctuation of the numberof revolutions may be avoided.

In order to minimize the sparks which occur during the opening of thecircuit, a resistance 53 is permanently interpolated between parts 25,35, which resistance should be comparatively high to avoid waste ofelectric energy. If the contact is broken between parts 23, 34, theopening or extra current thus produced will find its way through saidresistance.

It will be seen that by the construction described, the speed of theelectromotor can be diminished to any extent desired without the use ofa resistance. In this way loss of energy is obviated and a diminution ofpower is avoided. Furthermore, by dispensing with the speed reducinggearing heretofore generally I used, a"- practically noiseless workingof the motor is insured.

1. In a device of the character described, a governor. operable .by anelectromotorshaft, an axially movable plunger constituting acontact-member, a cam operably connected to the plunger, aspring-influenced contact-lever adapted to be advanced into engagementwith the plunger by the governor, and anelectromotor-circuit controlledby the plunger and lever.

2. In a device of the character described, a governor operable by anelectromotorshaft, an axially movable recessed plunger constituting acontact-member, a cam engaging the plunger-recess, a spring-infiuencedcontact-lever adapted to be advanced into engagement with the plunger bythe governor, and an electromotor-circuit controlled by the plunger andlever.

3. In a device of the character described, a governor operable by anelectromotorshaft, an axially movable recessed plunger constituting acontact-member, a' cam engaging the plunger-recess, a spring-influencedccntact-lever adapted to be advanced into engagement with the plunger bythe governor, an electromotor-olrcuit controlled by the plunger andlever, and a speed-indicator coacting with the'cam.

4'. In a device of the character described, a governor operable by anelectromotorshaft, an axially movable recessed plunger constituting acontact-member, a cam engaging the plunger-recess, a spring-in fluencedcontact-lever adapted to be advanced into engagement with the plunger bythe governor, an electromotor-circuit controlled by the plunger andlever, a resistance permanently interpolated between the plunger andlever, and a speed-indicator coacting with the cam.

BENJAMIN F. HUTCHES, JR. Witnesses:

l/VILLIAM R. SoHULz, FRANK v. BRIESEN.

